Study On The Preparation And Performance Of Silver-based Transducers By Inkjet Printing

In order to simplify the manufacturing process of energy-conversion element and adopt to the development trend of miniaturization and integration of energy-conversion element of initiating explosive devices,the energy-conversion element is prepared by inkjet printing method in this paper.The silver film is prepared by inkjet printing technology,and the prepared silver film energy-conversion element is assembled into initiating explosive devices.The main work is as follows:(1)In order to design an energy-conversion element that is more prone to electric explosion,silver is selected as the energy-conversion element material because of its low boiling point.The silver film energy conversion element was prepared by inkjet printing.Design the energy exchange element pattern and prepare the silver energy exchange element with DMP-2850 inkjet printer,and the printing parameters(piezoelectric waveform,substrate temperature,printing layers,printing point spacing),substrate selection and postprocessing conditions(sintering temperature and sintering time)were studied on the morphology and resistivity of silver film.The optium for silver film preparation are obtained as follows: silica as the base material,square bridge structure,double waveform low voltage as the voltage supply method of ink cartridge piezoelectric crystal,and the inkjet spacing is set to 25 μm.The nozzle temperature is set at 37 ℃,the substrate temperature is set at 55 ℃,and the curing process is 150 ℃,sintering for 60 min.(2)The printed silver film energy-conversion element is assembled into a silver film bridge through the processes of patch,dropping silver slurry and so on.Its pulse action process,ignition performance and safety performance are tested and compared with that of semiconductor bridge.The results show that the silver film bridge is similar to that of semiconductor bridge in pulse action and silver film bridge has the advantage of fast electric explosion due to the low melting boiling point of silver material,which is conducive to pulse ignition.Under the condition of pulse discharge,the 50% ignition voltage of silver film bridge is 6.176 V,which is lower than the 8.917 V of semiconductor bridge.Under the action of constant current,the 50% ignition current of silver film bridge is 2.632 A,which is higher than the 2.150 A of semiconductor bridge.The silver film bridge has excellent safety performance.The silver film bridge ignition dipped with lead styphnate can meet the requirement that the insensitive initiating explosive device 1A1W5 min does not ignite.The silver film bridge igniter dipped with lead styphnate can withstand the electrostatic action of30 k V,which is better than bridge wire initiating explosive devices and unprotected semiconductors bridge.(3)In order to further improve the output of silver film bridge,silver azide was obtained by in-situ reaction of inkjet printing energetic precursor ink on silver film bridge.By comparision of different methods,the method of printing silver perchlorate ink and sodium azide ink was determined to prepare energetic silver bridge,and the performance of energetic silver bridge was analyzed.The current-voltage curve of silver azide energetic bridge is recorded,the results show that the action process of energetic silver bridge is basically similar to that of silver film bridge,but the action process of energetic silver bridge is faster.The infrared temperature measurement show that the ignition temperature of energetic silver bridge is higher than that of silver film bridge.The high-speed photographic image investigates that energetic silver bridge has higher flame and larger flame area than silver film bridge.When loaded with 950 mg Cl-20(ρ=1.84g/cm3),energetic silver bridge could ignite Cl-20 directly and violent deflagration is formed,and the shell and ceramic plug are broken.The research indicates that the energetic silver bridge had a stronger output capacity than the silver film bridge.